Regarding the issue with the heat exchanger bypass line
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I often see that the bypass lines of some heat exchangers are also equipped with control valve assemblies. What is the purpose of these?
Are you referring to a three-way valve, the kind used for adjusting temperature?
This situation is generally used to adjust the temperature of the mid-section reflux returning to the tower
Two single control valves are used in place of a three-way valve to regulate the flow rate of the material passing through the main line of the heat exchanger.
The heat exchange temperature is adjusted by varying the flow rate, which is commonly used to control the temperature after heat exchange in order to regulate product quality or the heat balance within the tower.
It depends on where it is used; some are also used to regulate the temperature of crude oil entering the electrodesalination unit.
A heat exchanger with a bypass line and control valves is used to control the temperature of the container in which the heat exchanger is located.
A three-way valve regulates temperature by adjusting the ratio of hot to cold streams without affecting flow rate.
It is used to regulate temperature by controlling the flow rate; this is also one of the functions of a heat exchanger
It should be controlling the temperature or material flow rate
It should be a temperature-based stage control valve, one on the bypass line of the heat exchanger and another on the line leading to the heat exchanger.